Dayco Automatic Belt Tensioner BMW 320Ci 320i 325Ci 325i 325Ti 330Ci 330i 523i

Dayco No Slack Automatic Belt Tensioner

Designed to maintain constant tension on serpentine belt drives
Serpentine belt drives consist of a single belt that powers most, if not all, of the engine’s accessories.

To maintain the proper tension throughout the drive, an automatic, spring-loaded tensioner is incorporated into the drive system geometry.

Dayco’s Automatic Belt Tensioner features a patented “flat spring” design that’s engineered to provide less operating range variations in tension.

This reduces the risk of premature accessory bearing failure due to high tension when a new belt is installed.

It also lessens the risk of belt squeal and slippage, or poor accessory performance caused by low tension after the belt begins to stretch and wear. A Teflon strip wound within the spring resists abrasion.

The flat spring itself is coated to resist rust.

Other superior design features include a steel locator pin (where the application demands).

A heavy-duty cast aluminium spring case resists cracking and fatigue. The heavy-duty cast aluminium arm offers additional strength and less distortion.

An aluminium retainer ring locks the spring case and arm together, and seals against corrosion.

A steel pivot tube (where the application demands) provides additional strength for critical torque requirements.

A thermoplastic rubber “spring slot plug” keeps out harmful contaminants. The lubricated nylon “pivot tube bushing” and “spring bushing” promote quieter performance.

A rubber “O” ring seals against dust and grime.

The zinc coated mounting bolt resists rust, and is concentric for a more even degree of constant tension.

In order to meet OEM performance standards, Dayco Automatic Tensioners come with either a glass-filled polymer (plastic) or steel pulley, that features a dust cover to protect against contaminants.

Fits the following Make, Model, Series:

BMW > 320Ci > Oct 2000 - Feb 2007, 2.2L, 6 cyl, 24V, DOHC, MPFI, E46, 125kW, EngCode: M54B22

BMW > 320i > Oct 2000 - Aug 2002, 2.2L, 6 cyl, 24V, DOHC, MPFI, E46, EngCode: M54B22

BMW > 320i > Sep 2002 - May 2007, 2.2L, 6 cyl, 24V, DOHC, MPFI, E46, EngCode: M54B22

BMW > 325Ci > Sep 2002 - Feb 2007, 2.5L, 6 cyl, 24V, DOHC, MPFI, E46, 141kW, EngCode: M54B25

BMW > 325i > Sep 2002 - Apr 2005, 2.5L, 6 cyl, 24V, DOHC, MPFI, E46, EngCode: M52B25

BMW > 325Ti > 2001 - Jul 2005, 2.5L, 6 cyl, 24V, DOHC, MPFI, E46, 141kW, EngCode: M54B25

BMW > 330Ci > Sep 2000 - Aug 2002, 3.0L, 6 cyl, 24V, DOHC, MPFI, E46, EngCode: M54B30

BMW > 330Ci > Sep 2002 - Feb 2007, 3.0L, 6 cyl, 24V, DOHC, MPFI, E46, EngCode: M54B30

BMW > 330i > Sep 2000 - Apr 2005, 3.0L, 6 cyl, 24V, DOHC, MPFI, E46, 170kW, EngCode: M54B30

BMW > 523i > Apr 1996 - Mar 1998, 2.5L, 6 cyl, 24V, DOHC, MPFI, E39, 125kW, EngCode: M52TUB25

BMW > 523i > Apr 1998 - Sep 1998, 2.5L, 6 cyl, 24V, DOHC, MPFI, E39, 125kW, EngCode: M52TUB25

BMW > 523i > Oct 1998 - Nov 2003, 2.5L, 6 cyl, 24V, DOHC, MPFI, E39, 125kW, EngCode: M52TUB25

BMW > 525i > 2000 - 2003, 2.5L, 6 cyl, 24V, DOHC, EFI, E39, 135kW, EngCode: M54B25

BMW > 525i > Dec 2000 - Aug 2002, 2.5L, 6 cyl, 24V, DOHC, MPFI, E39, EngCode: M52B25

BMW > 525i > Sep 2002 - Oct 2003, 2.5L, 6 cyl, 24V, DOHC, MPFI, E39, EngCode: M52B25

BMW > 525i > 2003 - 2005, 2.5L, 6 cyl, 24V, DOHC, EFI, E60, 135kW, EngCode: M54B25

BMW > 530i > Sep 2002 - Sep 2003, 3.0L, 6 cyl, 24V, DOHC, MPFI, E39, 170kW, EngCode: M54B30

BMW > 530i > Oct 2003 - Apr 2005, 3.0L, 6 cyl, 24V, DOHC, MPFI, E60, 170kW, EngCode: M54B30

BMW > X3 > Jun 2004 - Nov 2006, 2.5L, 6 cyl, 24V, DOHC, MPFI, E83 25i, 141kW, EngCode: M54B25

BMW > X3 > Jun 2004 - Nov 2006, 3.0L, 6 cyl, 24V, DOHC, MPFI, E83, 170kW, EngCode: M54B30

BMW > Z4 > Jul 2003 - Mar 2006, 2.5L, 6 cyl, 24V, DOHC, MPFI, E85, EngCode: M54B25

BMW > Z4 > Jul 2003 - Mar 2006, 3.0L, 6 cyl, 24V, DOHC, MPFI, E85, EngCode: M54B30

BMW > Z4 > 2004 - 2006, 2.2L, 6 cyl, 24V, DOHC, EFI, E85, 110kW, EngCode: M54B22

BMW > Z4 > Apr 2006 - Apr 2009, 2.5L, 6 cyl, 24V, DOHC, MPFI, E85, EngCode: M54B25

BMW > Z4 > Apr 2006 - Apr 2009, 3.0L, 6 cyl, 24V, DOHC, MPFI, E85, EngCode: M54B30